Continuous-wave Vertical-cavity Surface-emitting Lasers Research Articles

Flat Broadband Chaos in Vertical-Cavity Surface-Emitting Lasers Subject to Chaotic Optical Injection

Four schemes for the generation of chaos in vertical-cavity surface-emitting lasers (VCSELs) by optical feedback and/or optical injection have been evaluated experimentally. The experimental results show that the preferred scheme is to effect chaotic optical injection into a stable operating VCSEL. This is an effective method to generate a flat broad-bandwidth chaotic signal with the bandwidth of the chaotic signal being enhanced by more than four times compared with that obtained using optical feedback. In addition, the chaotic signal generated by chaotic optical injection has a flat power spectrum. If a continuous wave (CW) signal is injected into a chaotic VCSEL, the bandwidth of chaos can also be enhanced, but less than that using the preferred scheme. Moreover, the spectrum in this case is not very flat. For CW optical injection into a CW VCSEL, the power spectrum of the chaos has many peaks and so is not suitable for applications in chaotic optical communication and random number generation. Injecting chaotic light into a chaotic VCSEL provides little enhancement of the chaos bandwidth.

Electrically pumped room temperature CW VCSELs with 2.3 /spl mu/m emission wavelength

Continuous wave (CW) operation at room temperature of electrically pumped InGaAlAs/InP vertical-cavity surface-emitting lasers (VCSELs) at emission wavelengths as high as 2.3 µm is demonstrated for the first time. Devices with 15 µm active region diameter show a maximum output power of 0.75 mW at 20°C and a maximum CW operating temperature of 45°C.

Electrically pumped room temperature CW VCSELs with 2.3 [micro sign]m emission wavelength

Continuous wave (CW) operation at room temperature of electrically pumped InGaAlAs/InP vertical-cavity surface-emitting lasers (VCSELs) at emission wavelengths as high as 2.3 µm is demonstrated for the first time. Devices with 15 µm active region diameter show a maximum output power of 0.75 mW at 20°C and a maximum CW operating temperature of 45°C.